Rotor Seal, 2-Groove Back Catalog number: CTS-21163 Availability: In the manufacturer's stock Price on request - + Recommended 11-4048 PEEK™ Needle Seal, SIL-30AC, SIL-30ACMP Price on request 11-2401 Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Price on request CTS-10987 717 Performance Maintenance Kit Price on request